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greptimedb/tests/cases/standalone/common/promql/null_samples.result
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discord9 7cf45a21a2 fix(promql): backport NULL samples and counter extrapolation fixes
Adapt PR #9118 at d0aa4ecb7b to release control flow, retaining the #9089 reset-index precision fix. Import upstream generated SQL expectations.

Co-authored-by: Dennis Zhuang <killme2008@gmail.com>
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
(cherry picked from commit ec8691a9186ab42d9d5f2ee1f2ea154112921b96)
Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
2026-09-14 15:00:46 +08:00

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-- NULL fields are missing samples, not zero-valued samples.
CREATE TABLE null_samples (
ts TIMESTAMP(3) TIME INDEX,
host STRING PRIMARY KEY,
val DOUBLE,
);
Affected Rows: 0
INSERT INTO null_samples VALUES
(0, 'a', 1.0),
(1000, 'a', NULL),
(2000, 'a', NULL),
(3000, 'a', 4.0),
(0, 'b', NULL),
(1000, 'b', NULL),
(2000, 'b', NULL),
(3000, 'b', NULL);
Affected Rows: 8
-- At t=2 the trailing NULLs must not hide 1; at t=3 count must be 2.
-- At t=7 the left-open window is empty. Valid results must disappear.
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (2, 7, '1s') count_over_time(null_samples{host="a"}[4s]);
+---------------------+------------------------------------+------+
| ts | prom_count_over_time(ts_range,val) | host |
+---------------------+------------------------------------+------+
| 1970-01-01T00:00:02 | 1.0 | a |
| 1970-01-01T00:00:03 | 2.0 | a |
| 1970-01-01T00:00:04 | 1.0 | a |
| 1970-01-01T00:00:05 | 1.0 | a |
| 1970-01-01T00:00:06 | 1.0 | a |
+---------------------+------------------------------------+------+
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (2, 7, '1s') last_over_time(null_samples{host="a"}[4s]);
+---------------------+-----------------------------------+------+
| ts | prom_last_over_time(ts_range,val) | host |
+---------------------+-----------------------------------+------+
| 1970-01-01T00:00:02 | 1.0 | a |
| 1970-01-01T00:00:03 | 4.0 | a |
| 1970-01-01T00:00:04 | 4.0 | a |
| 1970-01-01T00:00:05 | 4.0 | a |
| 1970-01-01T00:00:06 | 4.0 | a |
+---------------------+-----------------------------------+------+
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (2, 7, '1s') present_over_time(null_samples{host="a"}[4s]);
+---------------------+--------------------------------------+------+
| ts | prom_present_over_time(ts_range,val) | host |
+---------------------+--------------------------------------+------+
| 1970-01-01T00:00:02 | 1.0 | a |
| 1970-01-01T00:00:03 | 1.0 | a |
| 1970-01-01T00:00:04 | 1.0 | a |
| 1970-01-01T00:00:05 | 1.0 | a |
| 1970-01-01T00:00:06 | 1.0 | a |
+---------------------+--------------------------------------+------+
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (2, 7, '1s') absent_over_time(null_samples{host="a"}[4s]);
+---------------------+-------------------------------------+------+
| ts | prom_absent_over_time(ts_range,val) | host |
+---------------------+-------------------------------------+------+
| 1970-01-01T00:00:07 | 1.0 | a |
+---------------------+-------------------------------------+------+
-- All-NULL windows have no samples: only absent_over_time returns 1.
TQL EVAL (3, 3, '1s') count_over_time(null_samples{host="b"}[4s]);
++
++
TQL EVAL (3, 3, '1s') last_over_time(null_samples{host="b"}[4s]);
++
++
TQL EVAL (3, 3, '1s') present_over_time(null_samples{host="b"}[4s]);
++
++
TQL EVAL (3, 3, '1s') absent_over_time(null_samples{host="b"}[4s]);
+---------------------+-------------------------------------+------+
| ts | prom_absent_over_time(ts_range,val) | host |
+---------------------+-------------------------------------+------+
| 1970-01-01T00:00:03 | 1.0 | b |
+---------------------+-------------------------------------+------+
-- Every function below sees the same two samples, 1.0 at 0s and 4.0 at 3s.
TQL EVAL (3, 3, '1s') rate(null_samples{host="a"}[4s]);
+---------------------+----------------------------------------+------+
| ts | prom_rate(ts_range,val,ts,Int64(4000)) | host |
+---------------------+----------------------------------------+------+
| 1970-01-01T00:00:03 | 1.0 | a |
+---------------------+----------------------------------------+------+
TQL EVAL (3, 3, '1s') increase(null_samples{host="a"}[4s]);
+---------------------+--------------------------------------------+------+
| ts | prom_increase(ts_range,val,ts,Int64(4000)) | host |
+---------------------+--------------------------------------------+------+
| 1970-01-01T00:00:03 | 4.0 | a |
+---------------------+--------------------------------------------+------+
TQL EVAL (3, 3, '1s') delta(null_samples{host="a"}[4s]);
+---------------------+-----------------------------------------+------+
| ts | prom_delta(ts_range,val,ts,Int64(4000)) | host |
+---------------------+-----------------------------------------+------+
| 1970-01-01T00:00:03 | 4.0 | a |
+---------------------+-----------------------------------------+------+
TQL EVAL (3, 3, '1s') idelta(null_samples{host="a"}[4s]);
+---------------------+---------------------------+------+
| ts | prom_idelta(ts_range,val) | host |
+---------------------+---------------------------+------+
| 1970-01-01T00:00:03 | 3.0 | a |
+---------------------+---------------------------+------+
TQL EVAL (3, 3, '1s') irate(null_samples{host="a"}[4s]);
+---------------------+--------------------------+------+
| ts | prom_irate(ts_range,val) | host |
+---------------------+--------------------------+------+
| 1970-01-01T00:00:03 | 1.0 | a |
+---------------------+--------------------------+------+
TQL EVAL (3, 3, '1s') changes(null_samples{host="a"}[4s]);
+---------------------+----------------------------+------+
| ts | prom_changes(ts_range,val) | host |
+---------------------+----------------------------+------+
| 1970-01-01T00:00:03 | 1.0 | a |
+---------------------+----------------------------+------+
TQL EVAL (3, 3, '1s') resets(null_samples{host="a"}[4s]);
+---------------------+---------------------------+------+
| ts | prom_resets(ts_range,val) | host |
+---------------------+---------------------------+------+
| 1970-01-01T00:00:03 | 0.0 | a |
+---------------------+---------------------------+------+
TQL EVAL (3, 3, '1s') avg_over_time(null_samples{host="a"}[4s]);
+---------------------+----------------------------------+------+
| ts | prom_avg_over_time(ts_range,val) | host |
+---------------------+----------------------------------+------+
| 1970-01-01T00:00:03 | 2.5 | a |
+---------------------+----------------------------------+------+
TQL EVAL (3, 3, '1s') stddev_over_time(null_samples{host="a"}[4s]);
+---------------------+-------------------------------------+------+
| ts | prom_stddev_over_time(ts_range,val) | host |
+---------------------+-------------------------------------+------+
| 1970-01-01T00:00:03 | 1.5 | a |
+---------------------+-------------------------------------+------+
TQL EVAL (3, 3, '1s') stdvar_over_time(null_samples{host="a"}[4s]);
+---------------------+-------------------------------------+------+
| ts | prom_stdvar_over_time(ts_range,val) | host |
+---------------------+-------------------------------------+------+
| 1970-01-01T00:00:03 | 2.25 | a |
+---------------------+-------------------------------------+------+
TQL EVAL (3, 3, '1s') quantile_over_time(0.5, null_samples{host="a"}[4s]);
+---------------------+----------------------------------------------------+------+
| ts | prom_quantile_over_time(ts_range,val,Float64(0.5)) | host |
+---------------------+----------------------------------------------------+------+
| 1970-01-01T00:00:03 | 2.5 | a |
+---------------------+----------------------------------------------------+------+
-- A window whose only slot is NULL holds no sample, like a window with no row.
TQL EVAL (1, 1, '1s') rate(null_samples{host="a"}[1s]);
++
++
-- Prometheus returns an empty vector for a range without samples, not NaN.
TQL EVAL (1, 1, '1s') quantile_over_time(0.5, null_samples{host="a"}[1s]);
++
++
-- `b` never has a sample, so it must not reach the aggregation.
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (0, 15, '1s') avg by (host) (rate(null_samples[4s]));
+------+---------------------+---------------------------------------------+
| host | ts | avg(prom_rate(ts_range,val,ts,Int64(4000))) |
+------+---------------------+---------------------------------------------+
| a | 1970-01-01T00:00:03 | 1.0 |
+------+---------------------+---------------------------------------------+
DROP TABLE null_samples;
Affected Rows: 0
CREATE TABLE multi_field (
ts TIMESTAMP(3) TIME INDEX,
host STRING PRIMARY KEY,
f1 DOUBLE,
f2 DOUBLE
);
Affected Rows: 0
INSERT INTO multi_field VALUES
(0, 'a', 1.0, 10.0),
(1000, 'a', 2.0, NULL),
(2000, 'a', 3.0, NULL),
(3000, 'a', 4.0, 40.0);
Affected Rows: 4
-- f1 has two samples in this window and f2 only one, so f1 keeps its result while f2 is NULL.
-- Dropping the whole row would take f1's samples with it.
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (1, 1, '1s') rate(multi_field[4s]);
+---------------------+---------------------------------------+---------------------------------------+------+
| ts | prom_rate(ts_range,f1,ts,Int64(4000)) | prom_rate(ts_range,f2,ts,Int64(4000)) | host |
+---------------------+---------------------------------------+---------------------------------------+------+
| 1970-01-01T00:00:01 | 0.375 | | a |
+---------------------+---------------------------------------+---------------------------------------+------+
-- A selector emits the same shape: the row stays, the field without a sample is NULL.
-- SQLNESS SORT_RESULT 3 1
TQL EVAL (1, 1, '1s') multi_field;
+---------------------+------+-----+----+
| ts | host | f1 | f2 |
+---------------------+------+-----+----+
| 1970-01-01T00:00:01 | a | 2.0 | |
+---------------------+------+-----+----+
DROP TABLE multi_field;
Affected Rows: 0